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prevent busy loop when tty could not be opened

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This commit is contained in:
folkert van heusden 2024-05-17 19:23:04 +02:00
parent 93043c25b8
commit 423704f63d
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
1 changed files with 18 additions and 4 deletions
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22
comm_posix_tty.cpp
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@ -34,6 +34,7 @@ comm_posix_tty::comm_posix_tty(const std::string & device, const int bitrate)
if (tcgetattr(fd, &tty) == -1) {
DOLOG(warning, false, "com_posix_tty tcgetattr failed: %s", strerror(errno));
close(fd);
fd = -1;
return;
}
@ -61,22 +62,27 @@ comm_posix_tty::comm_posix_tty(const std::string & device, const int bitrate)
if (tcsetattr(fd, TCSANOW, &tty) == -1) {
DOLOG(warning, false, "com_posix_tty tcsetattr failed: %s", strerror(errno));
close(fd);
fd = -1;
return;
}
}
comm_posix_tty::~comm_posix_tty()
{
close(fd);
if (fd != -1)
close(fd);
}
bool comm_posix_tty::is_connected()
{
return true;
return fd != -1;
}
bool comm_posix_tty::has_data()
{
if (fd == -1)
return false;
#if defined(_WIN32)
WSAPOLLFD fds[] { { fd, POLLIN, 0 } };
int rc = WSAPoll(fds, 1, 0);
@ -91,7 +97,11 @@ bool comm_posix_tty::has_data()
uint8_t comm_posix_tty::get_byte()
{
uint8_t c = 0;
read(fd, &c, 1); // TODO error handling
if (read(fd, &c, 1) <= 0) {
DOLOG(warning, false, "com_posix_tty cannot read");
close(fd);
fd = -1;
}
return c;
}
@ -103,8 +113,12 @@ void comm_posix_tty::send_data(const uint8_t *const in, const size_t n)
while(len > 0) {
int rc = write(fd, p, len);
if (rc <= 0) // TODO error checking
if (rc <= 0) { // TODO error checking
DOLOG(warning, false, "com_posix_tty cannot write");
close(fd);
fd = -1;
break;
}
p += rc;
len -= rc;